Date: Mon, 11 Jun 2012 00:37:30 +0200 From: Oliver Pinter <oliver.pntr@gmail.com> To: =?ISO-8859-1?Q?Dag=2DErling_Sm=F8rgrav?= <des@des.no> Cc: freebsd-security@freebsd.org Subject: blf uses only 2^4 round for passwd encoding?! [Re: Default password hash] Message-ID: <CAPjTQNGOLfb64rtz3gu4xGF8aqzcjD5QBEjM_gwwAykKQoyWgA@mail.gmail.com>
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http://svnweb.freebsd.org/base/head/secure/lib/libcrypt/crypt-blowfish.c?re= vision=3D231986&view=3Dmarkup 145 static const char *magic =3D "$2a$04$"; 146 147 /* Defaults */ 148 minr =3D 'a'; 149 logr =3D 4; 150 rounds =3D 1 << logr; 151 152 /* If it starts with the magic string, then skip that */ 153 if(!strncmp(salt, magic, strlen(magic))) { 154 salt +=3D strlen(magic); 155 } grep 04 /etc/master.passwd: root:$2a$04$XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:0:0::0:0:= XXX:/root:/bin/csh xxxx:$2a$04$XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:100X:100X= ::0:0:XXXXXXXXXXXXX:/home/xxxx:/bin/tcsh 16 rounds in 2012? It is not to weak?! On 6/8/12, Dag-Erling Sm=F8rgrav <des@des.no> wrote: > We still have MD5 as our default password hash, even though known-hash > attacks against MD5 are relatively easy these days. We've supported > SHA256 and SHA512 for many years now, so how about making SHA512 the > default instead of MD5, like on most Linux distributions? > > Index: etc/login.conf > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > --- etc/login.conf (revision 236616) > +++ etc/login.conf (working copy) > @@ -23,7 +23,7 @@ > # AND SEMANTICS'' section of getcap(3) for more escape sequences). > > default:\ > - :passwd_format=3Dmd5:\ > + :passwd_format=3Dsha512:\ > :copyright=3D/etc/COPYRIGHT:\ > :welcome=3D/etc/motd:\ > :setenv=3DMAIL=3D/var/mail/$,BLOCKSIZE=3DK,FTP_PASSIVE_MODE=3DYES= :\ > > DES > -- > Dag-Erling Sm=F8rgrav - des@des.no > _______________________________________________ > freebsd-security@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-security > To unsubscribe, send any mail to "freebsd-security-unsubscribe@freebsd.or= g" >
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